Coverage Report

Created: 2019-07-24 05:18

/Users/buildslave/jenkins/workspace/clang-stage2-coverage-R/llvm/tools/lld/include/lld/ReaderWriter/MachOLinkingContext.h
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//===- lld/ReaderWriter/MachOLinkingContext.h -----------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLD_READER_WRITER_MACHO_LINKING_CONTEXT_H
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#define LLD_READER_WRITER_MACHO_LINKING_CONTEXT_H
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#include "lld/Core/LinkingContext.h"
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#include "lld/Core/Reader.h"
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#include "lld/Core/Writer.h"
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#include "llvm/ADT/STLExtras.h"
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#include "llvm/ADT/StringMap.h"
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#include "llvm/ADT/StringSet.h"
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#include "llvm/BinaryFormat/MachO.h"
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#include "llvm/Support/ErrorHandling.h"
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#include <set>
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using llvm::MachO::HeaderFileType;
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namespace lld {
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namespace mach_o {
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class ArchHandler;
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class MachODylibFile;
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class MachOFile;
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class SectCreateFile;
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}
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class MachOLinkingContext : public LinkingContext {
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public:
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  MachOLinkingContext();
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  ~MachOLinkingContext() override;
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  enum Arch {
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    arch_unknown,
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    arch_ppc,
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    arch_x86,
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    arch_x86_64,
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    arch_armv6,
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    arch_armv7,
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    arch_armv7s,
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    arch_arm64,
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  };
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  enum class OS {
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    unknown,
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    macOSX,
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    iOS,
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    iOS_simulator
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  };
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  enum class ExportMode {
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    globals,    // Default, all global symbols exported.
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    whiteList,  // -exported_symbol[s_list], only listed symbols exported.
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    blackList   // -unexported_symbol[s_list], no listed symbol exported.
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  };
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  enum class DebugInfoMode {
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    addDebugMap,    // Default
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    noDebugMap      // -S option
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  };
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  enum class UndefinedMode {
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    error,
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    warning,
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    suppress,
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    dynamicLookup
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  };
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  enum ObjCConstraint {
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    objc_unknown = 0,
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    objc_supports_gc = 2,
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    objc_gc_only = 4,
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    // Image optimized by dyld = 8
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    // GC compaction = 16
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    objc_retainReleaseForSimulator = 32,
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    objc_retainRelease
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  };
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  /// Initializes the context to sane default values given the specified output
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  /// file type, arch, os, and minimum os version.  This should be called before
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  /// other setXXX() methods.
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  void configure(HeaderFileType type, Arch arch, OS os, uint32_t minOSVersion,
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                 bool exportDynamicSymbols);
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  void addPasses(PassManager &pm) override;
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  bool validateImpl() override;
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  std::string demangle(StringRef symbolName) const override;
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  void createImplicitFiles(std::vector<std::unique_ptr<File>> &) override;
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  /// Creates a new file which is owned by the context.  Returns a pointer to
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  /// the new file.
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  template <class T, class... Args>
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  typename std::enable_if<!std::is_array<T>::value, T *>::type
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  make_file(Args &&... args) const {
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    auto file = std::unique_ptr<T>(new T(std::forward<Args>(args)...));
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    auto *filePtr = file.get();
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    auto *ctx = const_cast<MachOLinkingContext *>(this);
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    ctx->getNodes().push_back(llvm::make_unique<FileNode>(std::move(file)));
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    return filePtr;
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  }
std::__1::enable_if<!(std::is_array<lld::mach_o::MachOFile>::value), lld::mach_o::MachOFile*>::type lld::MachOLinkingContext::make_file<lld::mach_o::MachOFile, char const (&) [29]>(char const (&&&) [29]) const
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  make_file(Args &&... args) const {
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    auto file = std::unique_ptr<T>(new T(std::forward<Args>(args)...));
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    auto *filePtr = file.get();
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    auto *ctx = const_cast<MachOLinkingContext *>(this);
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    ctx->getNodes().push_back(llvm::make_unique<FileNode>(std::move(file)));
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    return filePtr;
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  }
std::__1::enable_if<!(std::is_array<lld::mach_o::MachOFile>::value), lld::mach_o::MachOFile*>::type lld::MachOLinkingContext::make_file<lld::mach_o::MachOFile, char const (&) [18]>(char const (&&&) [18]) const
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  make_file(Args &&... args) const {
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    auto file = std::unique_ptr<T>(new T(std::forward<Args>(args)...));
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    auto *filePtr = file.get();
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    auto *ctx = const_cast<MachOLinkingContext *>(this);
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    ctx->getNodes().push_back(llvm::make_unique<FileNode>(std::move(file)));
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    return filePtr;
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  }
std::__1::enable_if<!(std::is_array<lld::mach_o::MachOFile>::value), lld::mach_o::MachOFile*>::type lld::MachOLinkingContext::make_file<lld::mach_o::MachOFile, char const (&) [19]>(char const (&&&) [19]) const
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  make_file(Args &&... args) const {
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    auto file = std::unique_ptr<T>(new T(std::forward<Args>(args)...));
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    auto *filePtr = file.get();
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    auto *ctx = const_cast<MachOLinkingContext *>(this);
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    ctx->getNodes().push_back(llvm::make_unique<FileNode>(std::move(file)));
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    return filePtr;
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  }
std::__1::enable_if<!(std::is_array<lld::mach_o::MachOFile>::value), lld::mach_o::MachOFile*>::type lld::MachOLinkingContext::make_file<lld::mach_o::MachOFile, char const (&) [20]>(char const (&&&) [20]) const
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  make_file(Args &&... args) const {
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    auto file = std::unique_ptr<T>(new T(std::forward<Args>(args)...));
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    auto *filePtr = file.get();
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    auto *ctx = const_cast<MachOLinkingContext *>(this);
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    ctx->getNodes().push_back(llvm::make_unique<FileNode>(std::move(file)));
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    return filePtr;
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  }
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  uint32_t getCPUType() const;
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  uint32_t getCPUSubType() const;
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  bool addEntryPointLoadCommand() const;
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  bool addUnixThreadLoadCommand() const;
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  bool outputTypeHasEntry() const;
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  bool is64Bit() const;
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  virtual uint64_t pageZeroSize() const { return _pageZeroSize; }
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  virtual uint64_t pageSize() const { return _pageSize; }
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  mach_o::ArchHandler &archHandler() const;
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  HeaderFileType outputMachOType() const { return _outputMachOType; }
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  Arch arch() const { return _arch; }
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  StringRef archName() const { return nameFromArch(_arch); }
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  OS os() const { return _os; }
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  ExportMode exportMode() const { return _exportMode; }
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  void setExportMode(ExportMode mode) { _exportMode = mode; }
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  void addExportSymbol(StringRef sym);
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  bool exportRestrictMode() const { return _exportMode != ExportMode::globals; }
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  bool exportSymbolNamed(StringRef sym) const;
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  DebugInfoMode debugInfoMode() const { return _debugInfoMode; }
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  void setDebugInfoMode(DebugInfoMode mode) {
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    _debugInfoMode = mode;
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  }
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  void appendOrderedSymbol(StringRef symbol, StringRef filename);
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  bool keepPrivateExterns() const { return _keepPrivateExterns; }
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  void setKeepPrivateExterns(bool v) { _keepPrivateExterns = v; }
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  bool demangleSymbols() const { return _demangle; }
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  void setDemangleSymbols(bool d) { _demangle = d; }
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  bool mergeObjCCategories() const { return _mergeObjCCategories; }
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  void setMergeObjCCategories(bool v) { _mergeObjCCategories = v; }
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  /// Create file at specified path which will contain a binary encoding
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  /// of all input and output file paths.
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  std::error_code createDependencyFile(StringRef path);
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  void addInputFileDependency(StringRef path) const;
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  void addInputFileNotFound(StringRef path) const;
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  void addOutputFileDependency(StringRef path) const;
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  bool minOS(StringRef mac, StringRef iOS) const;
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  void setDoNothing(bool value) { _doNothing = value; }
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  bool doNothing() const { return _doNothing; }
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  bool printAtoms() const { return _printAtoms; }
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  bool testingFileUsage() const { return _testingFileUsage; }
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  const StringRefVector &searchDirs() const { return _searchDirs; }
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  const StringRefVector &frameworkDirs() const { return _frameworkDirs; }
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  void setSysLibRoots(const StringRefVector &paths);
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  const StringRefVector &sysLibRoots() const { return _syslibRoots; }
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  bool PIE() const { return _pie; }
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  void setPIE(bool pie) { _pie = pie; }
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  bool generateVersionLoadCommand() const {
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    return _generateVersionLoadCommand;
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  }
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  void setGenerateVersionLoadCommand(bool v) {
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    _generateVersionLoadCommand = v;
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  }
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  bool generateFunctionStartsLoadCommand() const {
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    return _generateFunctionStartsLoadCommand;
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  }
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  void setGenerateFunctionStartsLoadCommand(bool v) {
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    _generateFunctionStartsLoadCommand = v;
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  }
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  bool generateDataInCodeLoadCommand() const {
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    return _generateDataInCodeLoadCommand;
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  }
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  void setGenerateDataInCodeLoadCommand(bool v) {
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    _generateDataInCodeLoadCommand = v;
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  }
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  uint64_t stackSize() const { return _stackSize; }
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  void setStackSize(uint64_t stackSize) { _stackSize = stackSize; }
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  uint64_t baseAddress() const { return _baseAddress; }
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  void setBaseAddress(uint64_t baseAddress) { _baseAddress = baseAddress; }
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  ObjCConstraint objcConstraint() const { return _objcConstraint; }
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  uint32_t osMinVersion() const { return _osMinVersion; }
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  uint32_t sdkVersion() const { return _sdkVersion; }
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  void setSdkVersion(uint64_t v) { _sdkVersion = v; }
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  uint64_t sourceVersion() const { return _sourceVersion; }
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  void setSourceVersion(uint64_t v) { _sourceVersion = v; }
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  uint32_t swiftVersion() const { return _swiftVersion; }
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  /// Checks whether a given path on the filesystem exists.
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  ///
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  /// When running in -test_file_usage mode, this method consults an
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  /// internally maintained list of files that exist (provided by -path_exists)
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  /// instead of the actual filesystem.
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  bool pathExists(StringRef path) const;
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  /// Like pathExists() but only used on files - not directories.
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  bool fileExists(StringRef path) const;
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  /// Adds any library search paths derived from the given base, possibly
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  /// modified by -syslibroots.
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  ///
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  /// The set of paths added consists of approximately all syslibroot-prepended
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  /// versions of libPath that exist, or the original libPath if there are none
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  /// for whatever reason. With various edge-cases for compatibility.
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  void addModifiedSearchDir(StringRef libPath, bool isSystemPath = false);
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  /// Determine whether -lFoo can be resolve within the given path, and
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  /// return the filename if so.
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  ///
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  /// The -lFoo option is documented to search for libFoo.dylib and libFoo.a in
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  /// that order, unless Foo ends in ".o", in which case only the exact file
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  /// matches (e.g. -lfoo.o would only find foo.o).
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  llvm::Optional<StringRef> searchDirForLibrary(StringRef path,
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                                                StringRef libName) const;
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  /// Iterates through all search path entries looking for libName (as
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  /// specified by -lFoo).
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  llvm::Optional<StringRef> searchLibrary(StringRef libName) const;
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  /// Add a framework search path.  Internally, this method may be prepended
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  /// the path with syslibroot.
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  void addFrameworkSearchDir(StringRef fwPath, bool isSystemPath = false);
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  /// Iterates through all framework directories looking for
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  /// Foo.framework/Foo (when fwName = "Foo").
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  llvm::Optional<StringRef> findPathForFramework(StringRef fwName) const;
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  /// The dylib's binary compatibility version, in the raw uint32 format.
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  ///
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  /// When building a dynamic library, this is the compatibility version that
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  /// gets embedded into the result. Other Mach-O binaries that link against
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  /// this library will store the compatibility version in its load command. At
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  /// runtime, the loader will verify that the binary is compatible with the
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  /// installed dynamic library.
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170
  uint32_t compatibilityVersion() const { return _compatibilityVersion; }
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  /// The dylib's current version, in the the raw uint32 format.
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  ///
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  /// When building a dynamic library, this is the current version that gets
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  /// embedded into the result. Other Mach-O binaries that link against
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  /// this library will store the compatibility version in its load command.
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  uint32_t currentVersion() const { return _currentVersion; }
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  /// The dylib's install name.
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  ///
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  /// Binaries that link against the dylib will embed this path into the dylib
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  /// load command. When loading the binaries at runtime, this is the location
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  /// on disk that the loader will look for the dylib.
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  StringRef installName() const { return _installName; }
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  /// Whether or not the dylib has side effects during initialization.
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  ///
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  /// Dylibs marked as being dead strippable provide the guarantee that loading
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  /// the dylib has no side effects, allowing the linker to strip out the dylib
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  /// when linking a binary that does not use any of its symbols.
270
  bool deadStrippableDylib() const { return _deadStrippableDylib; }
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272
  /// Whether or not to use flat namespace.
273
  ///
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  /// MachO usually uses a two-level namespace, where each external symbol
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  /// referenced by the target is associated with the dylib that will provide
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  /// the symbol's definition at runtime. Using flat namespace overrides this
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  /// behavior: the linker searches all dylibs on the command line and all
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  /// dylibs those original dylibs depend on, but does not record which dylib
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  /// an external symbol came from. At runtime dyld again searches all images
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  /// and uses the first definition it finds. In addition, any undefines in
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  /// loaded flat_namespace dylibs must be resolvable at build time.
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345
  bool useFlatNamespace() const { return _flatNamespace; }
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  /// How to handle undefined symbols.
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  ///
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  /// Options are:
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  ///  * error: Report an error and terminate linking.
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  ///  * warning: Report a warning, but continue linking.
289
  ///  * suppress: Ignore and continue linking.
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  ///  * dynamic_lookup: For use with -twolevel namespace: Records source dylibs
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  ///    for symbols that are defined in a linked dylib at static link time.
292
  ///    Undefined symbols are handled by searching all loaded images at
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  ///    runtime.
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184
  UndefinedMode undefinedMode() const { return _undefinedMode; }
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296
  /// The path to the executable that will load the bundle at runtime.
297
  ///
298
  /// When building a Mach-O bundle, this executable will be examined if there
299
  /// are undefined symbols after the main link phase. It is expected that this
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  /// binary will be loading the bundle at runtime and will provide the symbols
301
  /// at that point.
302
  StringRef bundleLoader() const { return _bundleLoader; }
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4
  void setCompatibilityVersion(uint32_t vers) { _compatibilityVersion = vers; }
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  void setCurrentVersion(uint32_t vers) { _currentVersion = vers; }
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240
  void setInstallName(StringRef name) { _installName = name; }
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  void setDeadStrippableDylib(bool deadStrippable) {
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    _deadStrippableDylib = deadStrippable;
309
2
  }
310
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  void setUseFlatNamespace(bool flatNamespace) {
311
2
    _flatNamespace = flatNamespace;
312
2
  }
313
314
3
  void setUndefinedMode(UndefinedMode undefinedMode) {
315
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    _undefinedMode = undefinedMode;
316
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  }
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  void setBundleLoader(StringRef loader) { _bundleLoader = loader; }
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61
  void setPrintAtoms(bool value=true) { _printAtoms = value; }
320
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  void setTestingFileUsage(bool value = true) {
321
11
    _testingFileUsage = value;
322
11
  }
323
65
  void addExistingPathForDebug(StringRef path) {
324
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    _existingPaths.insert(path);
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65
  }
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327
  void addRpath(StringRef rpath);
328
169
  const StringRefVector &rpaths() const { return _rpaths; }
329
330
  /// Add section alignment constraint on final layout.
331
  void addSectionAlignment(StringRef seg, StringRef sect, uint16_t align);
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333
  /// Add a section based on a command-line sectcreate option.
334
  void addSectCreateSection(StringRef seg, StringRef sect,
335
                            std::unique_ptr<MemoryBuffer> content);
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337
  /// Returns true if specified section had alignment constraints.
338
  bool sectionAligned(StringRef seg, StringRef sect, uint16_t &align) const;
339
340
0
  StringRef dyldPath() const { return "/usr/lib/dyld"; }
341
342
  /// Stub creation Pass should be run.
343
  bool needsStubsPass() const;
344
345
  // GOT creation Pass should be run.
346
  bool needsGOTPass() const;
347
348
  /// Pass to add TLV sections.
349
  bool needsTLVPass() const;
350
351
  /// Pass to transform __compact_unwind into __unwind_info should be run.
352
  bool needsCompactUnwindPass() const;
353
354
  /// Pass to add shims switching between thumb and arm mode.
355
  bool needsShimPass() const;
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357
  /// Pass to add objc image info and optimized objc data.
358
  bool needsObjCPass() const;
359
360
  /// Magic symbol name stubs will need to help lazy bind.
361
  StringRef binderSymbolName() const;
362
363
  /// Used to keep track of direct and indirect dylibs.
364
  void registerDylib(mach_o::MachODylibFile *dylib, bool upward) const;
365
366
  // Reads a file from disk to memory. Returns only a needed chunk
367
  // if a fat binary.
368
  ErrorOr<std::unique_ptr<MemoryBuffer>> getMemoryBuffer(StringRef path);
369
370
  /// Used to find indirect dylibs. Instantiates a MachODylibFile if one
371
  /// has not already been made for the requested dylib.  Uses -L and -F
372
  /// search paths to allow indirect dylibs to be overridden.
373
  mach_o::MachODylibFile* findIndirectDylib(StringRef path);
374
375
  uint32_t dylibCurrentVersion(StringRef installName) const;
376
377
  uint32_t dylibCompatVersion(StringRef installName) const;
378
379
169
  ArrayRef<mach_o::MachODylibFile*> allDylibs() const {
380
169
    return _allDylibs;
381
169
  }
382
383
  /// Creates a copy (owned by this MachOLinkingContext) of a string.
384
9
  StringRef copy(StringRef str) { return str.copy(_allocator); }
385
386
  /// If the memoryBuffer is a fat file with a slice for the current arch,
387
  /// this method will return the offset and size of that slice.
388
  bool sliceFromFatFile(MemoryBufferRef mb, uint32_t &offset, uint32_t &size);
389
390
  /// Returns if a command line option specified dylib is an upward link.
391
  bool isUpwardDylib(StringRef installName) const;
392
393
  static bool isThinObjectFile(StringRef path, Arch &arch);
394
  static Arch archFromCpuType(uint32_t cputype, uint32_t cpusubtype);
395
  static Arch archFromName(StringRef archName);
396
  static StringRef nameFromArch(Arch arch);
397
  static uint32_t cpuTypeFromArch(Arch arch);
398
  static uint32_t cpuSubtypeFromArch(Arch arch);
399
  static bool is64Bit(Arch arch);
400
  static bool isHostEndian(Arch arch);
401
  static bool isBigEndian(Arch arch);
402
403
  /// Construct 32-bit value from string "X.Y.Z" where
404
  /// bits are xxxx.yy.zz.  Largest number is 65535.255.255
405
  static bool parsePackedVersion(StringRef str, uint32_t &result);
406
407
  /// Construct 64-bit value from string "A.B.C.D.E" where
408
  /// bits are aaaa.bb.cc.dd.ee.  Largest number is 16777215.1023.1023.1023.1023
409
  static bool parsePackedVersion(StringRef str, uint64_t &result);
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411
  void finalizeInputFiles() override;
412
413
  llvm::Error handleLoadedFile(File &file) override;
414
415
  bool customAtomOrderer(const DefinedAtom *left, const DefinedAtom *right,
416
                         bool &leftBeforeRight) const;
417
418
  /// Return the 'flat namespace' file. This is the file that supplies
419
  /// atoms for otherwise undefined symbols when the -flat_namespace or
420
  /// -undefined dynamic_lookup options are used.
421
111
  File* flatNamespaceFile() const { return _flatNamespaceFile; }
422
423
private:
424
  Writer &writer() const override;
425
  mach_o::MachODylibFile* loadIndirectDylib(StringRef path);
426
  void checkExportWhiteList(const DefinedAtom *atom) const;
427
  void checkExportBlackList(const DefinedAtom *atom) const;
428
  struct ArchInfo {
429
    StringRef                 archName;
430
    MachOLinkingContext::Arch arch;
431
    bool                      littleEndian;
432
    uint32_t                  cputype;
433
    uint32_t                  cpusubtype;
434
  };
435
436
  struct SectionAlign {
437
    StringRef segmentName;
438
    StringRef sectionName;
439
    uint16_t  align;
440
  };
441
442
  struct OrderFileNode {
443
    StringRef fileFilter;
444
    unsigned  order;
445
  };
446
447
  static bool findOrderOrdinal(const std::vector<OrderFileNode> &nodes,
448
                             const DefinedAtom *atom, unsigned &ordinal);
449
450
  static ArchInfo _s_archInfos[];
451
452
  std::set<StringRef> _existingPaths; // For testing only.
453
  StringRefVector _searchDirs;
454
  StringRefVector _syslibRoots;
455
  StringRefVector _frameworkDirs;
456
  HeaderFileType _outputMachOType = llvm::MachO::MH_EXECUTE;
457
  bool _outputMachOTypeStatic = false; // Disambiguate static vs dynamic prog
458
  bool _doNothing = false;             // for -help and -v which just print info
459
  bool _pie = false;
460
  Arch _arch = arch_unknown;
461
  OS _os = OS::macOSX;
462
  uint32_t _osMinVersion = 0;
463
  uint32_t _sdkVersion = 0;
464
  uint64_t _sourceVersion = 0;
465
  uint64_t _pageZeroSize = 0;
466
  uint64_t _pageSize = 4096;
467
  uint64_t _baseAddress = 0;
468
  uint64_t _stackSize = 0;
469
  uint32_t _compatibilityVersion = 0;
470
  uint32_t _currentVersion = 0;
471
  ObjCConstraint _objcConstraint = objc_unknown;
472
  uint32_t _swiftVersion = 0;
473
  StringRef _installName;
474
  StringRefVector _rpaths;
475
  bool _flatNamespace = false;
476
  UndefinedMode _undefinedMode = UndefinedMode::error;
477
  bool _deadStrippableDylib = false;
478
  bool _printAtoms = false;
479
  bool _testingFileUsage = false;
480
  bool _keepPrivateExterns = false;
481
  bool _demangle = false;
482
  bool _mergeObjCCategories = true;
483
  bool _generateVersionLoadCommand = false;
484
  bool _generateFunctionStartsLoadCommand = false;
485
  bool _generateDataInCodeLoadCommand = false;
486
  StringRef _bundleLoader;
487
  mutable std::unique_ptr<mach_o::ArchHandler> _archHandler;
488
  mutable std::unique_ptr<Writer> _writer;
489
  std::vector<SectionAlign> _sectAligns;
490
  mutable llvm::StringMap<mach_o::MachODylibFile*> _pathToDylibMap;
491
  mutable std::vector<mach_o::MachODylibFile*> _allDylibs;
492
  mutable std::set<mach_o::MachODylibFile*> _upwardDylibs;
493
  mutable std::vector<std::unique_ptr<File>> _indirectDylibs;
494
  mutable std::mutex _dylibsMutex;
495
  ExportMode _exportMode = ExportMode::globals;
496
  llvm::StringSet<> _exportedSymbols;
497
  DebugInfoMode _debugInfoMode = DebugInfoMode::addDebugMap;
498
  std::unique_ptr<llvm::raw_fd_ostream> _dependencyInfo;
499
  llvm::StringMap<std::vector<OrderFileNode>> _orderFiles;
500
  unsigned _orderFileEntries = 0;
501
  File *_flatNamespaceFile = nullptr;
502
  mach_o::SectCreateFile *_sectCreateFile = nullptr;
503
};
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505
} // end namespace lld
506
507
#endif // LLD_READER_WRITER_MACHO_LINKING_CONTEXT_H